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  • ffmpeg ffserver - create a mosaic from two 720p webcam feeds

    28 juillet 2015, par der_felix

    for a project i would like to take the video feeds (NO audio) of two logitech c920 webcams, put them side-by-side and stream them.
    the c920 is able to compress the video feed with h264 itself(if enabled) and delivers 1080p with upto 30fps.
    the stream is then loaded in an android app by a ffmpeg library and rendered to the screen.

    what i already know :
    i know that i can take multiple streams or input files and create a mosaic stream via the filter_complex module.
    http and h264 seem to be good for streaming, but other configurations are also welcom if they are faster/better.

    the question :
    but how can i start the cameras with v4l2, set the camera resoltution and camera internal encoding and use these streams to create the mosaic ?
    the mosaic should be unscaled (=2560x720px).

    and i very often get the error code 256 but didnt find a solution what it means.

    the system : laptop with usb3, ubuntu 15.04x64 ffmpeg 2.7.1 and ffserver 2.5.7

    thanks for your help

    ffserver config :

    HTTPPort 8080                
    
HTTPBindAddress 0.0.0.0      
    
MaxHTTPConnections 2000   
    
MaxClients 1000         
    
MaxBandwidth 50000
    
CustomLog -      
    
#NoDaemon       
    

    
<feed>         
    

    
File /tmp/feed1.ffm
    
Launch ffmpeg -f v4l2 - input_format h264 -i /dev/video0 -i /dev/video1 -size 1280x720 -r 30 -filter_complex "nullsrc=size=2560x720 [base]; [0:v] setpts=PTS-STARTPTS [left]; [1:v] setpts=PTS-STARTPTS [right]; [base][left] overlay=shortest=1 [tmp1]; [tmp1][right] overlay=shortest=1:x=1280"  -c:v libx264 -f mpegts
    

    
</feed>
    

    
<stream>
    

    
Feed feed1.ffm
    
Format mpegts      
    
VideoBitRate 1024   
    
#VideoBufferSize 1024
    
VideoFrameRate 30      
    
#VideoSize hd720      
    
VideoSize 2560x720
    
#VideoIntraOnly         
    
#VideoGopSize 12      
    
VideoCodec libx264      
    
NoAudio            
    
VideoQMin 3         
    
VideoQMax 31
    
NoDefaults
    

    
</stream>
    

    
<stream>        
    
   Format status
    
   #Only allow local people to get the status
    
   ACL allow localhost
    
   ACL allow 192.168.0.0 192.168.255.255
    
</stream>

    output :

    ubuntu@ubuntu:~$ ffserver
    
ffserver version 2.5.7-0ubuntu0.15.04.1 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
    
  configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
    
  libavutil      54. 15.100 / 54. 15.100
    
  libavcodec     56. 13.100 / 56. 13.100
    
  libavformat    56. 15.102 / 56. 15.102
    
  libavdevice    56.  3.100 / 56.  3.100
    
  libavfilter     5.  2.103 /  5.  2.103
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Tue Jul 28 10:13:44 2015 FFserver started.
    
Tue Jul 28 10:13:44 2015 Launch command line: ffmpeg -f v4l2 - input_format h264 -i /dev/video0 -i /dev/video1 -size 1280x720 -r 30 -filter_complex nullsrc=size=2560x720 [base]; [0:v] setpts=PTS-STARTPTS [left]; [1:v] setpts=PTS-STARTPTS [right]; [base][left] overlay=shortest=1 [tmp1]; [tmp1][right] overlay=shortest=1:x=1280 -c:v libx264 -f mpegts http://127.0.0.1:8080/feed1.ffm
    
feed1.ffm: Pid 17388 exited with status 256 after 0 seconds

    Hey guys !

    Here is our plan b for the mosaic stream.

    Alternative config :

    HTTPPort 8080         
    
HTTPBindAddress 0.0.0.0   
    
MaxHTTPConnections 2000   
    
MaxClients 1000         
    
MaxBandwidth 50000      
    
CustomLog -         
    

    
<feed>
    
File /tmp/feedlinks.ffm
    
Launch ffmpeg -f v4l2 -input_format h264 -vcodec h264 -i /dev/video0 -video_size 1280x720 -r 30
    
</feed>
    

    
<feed>
    
File /tmp/feedrechts.ffm
    
Launch ffmpeg -f v4l2 -input_format h264 -vcodec h264 -i /dev/video1 -video_size 1280x720 -r 30 
    
</feed>
    

    
<stream>
    
Feed feedlinks.ffm
    
Format mpegts
    
VideoBitRate 512
    
VideoFrameRate 30
    
VideoSize hd720
    
VideoCodec libx264
    
NoAudio
    
VideoQMin 3
    
VideoQMax 31
    
</stream>
    

    
<stream>
    
Feed feedrechts.ffm
    
Format mpegts
    
VideoBitRate 512
    
VideoFrameRate 30
    
VideoSize hd720
    
VideoCodec libx264
    
NoAudio
    
VideoQMin 3
    
VideoQMax 31
    
</stream>
    

    
<feed>
    
File /tmp/feedmosaic.ffm
    
Launch ffmpeg -i http://localhost:8080/testlinks.mpg -i http://localhost:8080/testrechts.mpg -filter_complex "nullsrc=size=2560x720 [base]; [0:v] setpts=PTS-STARTPTS [left]; [1:v] setpts=PTS-STARTPTS [right]; [base][left] overlay=shortest=1 [tmp1]; [tmp1][right] overlay=shortest=1:x=1280" -c:v libx264 -preset ultrafast -f mpegts
    
</feed>
    

    
<stream>
    
Feed feedmosaic.ffm
    
Format mpegts         # Format of the stream
    
VideoFrameRate 30      # Number of frames per second
    
VideoSize 2560x720
    
VideoCodec libx264      # Choose your codecs.
    
NoAudio            # Suppress audio
    
VideoQMin 3         # Videoquality ranges from 1 - 31 (worst to best)
    
VideoQMax 31
    
NoDefaults
    
</stream>
    

    
<stream>           # Server status URL
    
   Format status
    
   # Only allow local people to get the status
    
   ACL allow localhost
    
   ACL allow 192.168.0.0 192.168.255.255
    
   ACL allow 192.168.178.0 192.168.255.255
    
</stream>

    And this is the new output :

    ubuntu@ubuntu:~$ ffserver
    
ffserver version 2.5.7-0ubuntu0.15.04.1 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
    
  configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
    
  libavutil      54. 15.100 / 54. 15.100
    
  libavcodec     56. 13.100 / 56. 13.100
    
  libavformat    56. 15.102 / 56. 15.102
    
  libavdevice    56.  3.100 / 56.  3.100
    
  libavfilter     5.  2.103 /  5.  2.103
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
/etc/ffserver.conf:44: Setting default value for video bit rate tolerance = 128000. Use NoDefaults to disable it.
    
/etc/ffserver.conf:44: Setting default value for video rate control equation = tex^qComp. Use NoDefaults to disable it.
    
/etc/ffserver.conf:44: Setting default value for video max rate = 1024000. Use NoDefaults to disable it.
    
/etc/ffserver.conf:44: Setting default value for video buffer size = 1024000. Use NoDefaults to disable it.
    
/etc/ffserver.conf:61: Setting default value for video bit rate tolerance = 128000. Use NoDefaults to disable it.
    
/etc/ffserver.conf:61: Setting default value for video rate control equation = tex^qComp. Use NoDefaults to disable it.
    
/etc/ffserver.conf:61: Setting default value for video max rate = 1024000. Use NoDefaults to disable it.
    
/etc/ffserver.conf:61: Setting default value for video buffer size = 1024000. Use NoDefaults to disable it.
    
Tue Jul 28 11:13:01 2015 Codec bitrates do not match for stream 0
    
Tue Jul 28 11:13:01 2015 FFserver started.
    
Tue Jul 28 11:13:01 2015 Launch command line: ffmpeg -f v4l2 -input_format h264 -vcodec h264 -i /dev/video0 -video_size 1280x720 -r 30 http://127.0.0.1:8080/feedlinks.ffm
    
Tue Jul 28 11:13:01 2015 Launch command line: ffmpeg -f v4l2 -input_format h264 -vcodec h264 -i /dev/video1 -video_size 1280x720 -r 30 http://127.0.0.1:8080/feedrechts.ffm
    
Tue Jul 28 11:13:01 2015 Launch command line: ffmpeg -i http://localhost:8080/testlinks.mpg -i http://localhost:8080/testrechts.mpg -filter_complex nullsrc=size=2560x720 [base]; [0:v] setpts=PTS-STARTPTS [left]; [1:v] setpts=PTS-STARTPTS [right]; [base][left] overlay=shortest=1 [tmp1]; [tmp1][right] overlay=shortest=1:x=1280 -c:v libx264 -preset ultrafast -f mpegts http://127.0.0.1:8080/feedmosaic.ffm
    
Tue Jul 28 11:13:02 2015 127.0.0.1 - - [GET] "/feedlinks.ffm HTTP/1.1" 200 4175
    
Tue Jul 28 11:13:02 2015 127.0.0.1 - - [GET] "/feedrechts.ffm HTTP/1.1" 200 4175
    
Tue Jul 28 11:13:18 2015 127.0.0.1 - - [POST] "/feedmosaic.ffm HTTP/1.1" 200 4096
    
Tue Jul 28 11:13:18 2015 127.0.0.1 - - [GET] "/testlinks.mpg HTTP/1.1" 200 2130291
    
Tue Jul 28 11:13:18 2015 127.0.0.1 - - [GET] "/testrechts.mpg HTTP/1.1" 200 1244999
    
feedmosaic.ffm: Pid 18775 exited with status 256 after 17 seconds

    Thanks for your help !

  • When using ffmpeg to create mp4 video file from batch of images the whole process is very slow how can i make it faster ?

    29 juin 2015, par Brubaker Haim

    The whole process is slow and also in the end the video file when playing it the frames moving very slow.

    ffmpeg -framerate 1/5 -i screenshot%06d.jpg -c:v libx264 -r 30 -p
    
ix_fmt yuv420p out2.mp4

    Is that mean 1 frames each 5 seconds ?
    So if i will make 5/1 it will be 5 frames in a second ?
    What should be the best result ?

    And the second problem is that for testing i have 70 images but in the original i have over 1000 images is there any way to make all this process faster ?

  • Improve ffmpeg CPU usage by compramising quality

    20 juin 2015, par Hardik Juneja

    I am using FFMpeg for screen capturing.
    I am looking for a screen capturing tool that will run on 1000 of VMs (windows and mac).The VMs have limited CPU (1 core) and 2GB ram and No GPU.

    Currently I invoke ffmpeg with

    ffmpeg  -y -framerate 8 -f dshow -f gdigrab -i "desktop"  -c:v libx264  -crf 0 -preset ultrafast -threads 0 temp.mkv

    I am using gdigrab to capture screen ? Is there any better options that might reduce cpu usage ? or changing the encoder or format ?

    I am aiming for 4-5% reduction in CPU usage.

    Thanks in advance

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